qt@5 fails to build on Ubuntu/Pop!_OS 20.04

[wchoston]

I have been unsuccessful at installing qt@5 for use with Maxima/gnuplot. Installation has failed both when it was started as a dependency and on its own. Updating doesn't help, nor do I have any warnings from 'brew doctor'.
The output from 'brew install qt@5' is in the file
command_out.txt

I notice in line 8 of the file
"patching file qtwebengine/src/3rdparty/chromium/build/mac/find_sdk.py"
Is the reference to 'mac' relevant?

Additional information: When I run 'brew gist-logs qt@5' I get 'Error: Not Found' after some time.

Has anyone else successfully installed qt@5?

Thanks for any help.

=============================================================
In case people are more comfortable with gists, the output of some commands related to me trying to build qt@5 is here.
https://gist.github.com/wchoston/6c583cb865acf67a56caf2708ab98ce6
Note that the last two lines show that 'brew gist-logs qt@5' only gives me an error message.

The output of 'brew config' is here:
https://gist.github.com/wchoston/10fabd2894383f8930f2b1db15094693

[carlocab]

Try brew gist-logs qt@5 to generate more complete logs of your build. (Not that I'll be able to help you with those, but someone else might be able to.)

[wchoston]

When I run 'brew gist-logs qt@5', after a while I get the output 'Error: Not Found'. I should have mentioned this.